使用NEST将文档自动映射到elasticsearch无法正常工作

Question

I have a simple Dummy document in C#. I am trying to index it into elasticsearch for the first time using NEST client. But automaping is not working.

My dummy document is:

class DummyRecord {
    public string RecordName;
    public int RecordId;
}

And the main program is:

class Program
{
    static void Main(string[] args)
    {
        var node = new Uri("http://localhost:9200");
        var settings = new ConnectionSettings(node).DefaultTypeName("_doc");
        var client = new ElasticClient(settings);

        var doc = new DummyRecord {
            RecordName = "SOmething",
            RecordId = 1
        };

        var creaeIndexRespone = client.CreateIndex("DummyIndex",c => c.Mappings(ms=> ms.Map<DummyRecord>(m => m.AutoMap())));
        Console.WriteLine(creaeIndexRespone);

        var response = client.Index(doc, idx => idx.Index("DummyIndex"));
        Console.WriteLine(response);
        Console.ReadKey();
    }
}

All I am getting is the following output:

Invalid NEST response built from a unsuccessful low level call on PUT: /DummyIndex

Invalid NEST response built from a unsuccessful low level call on POST: /DummyIndex/_doc

How to get this thing working. Is there anything I have to do while creating the settings more than this??

var settings = new ConnectionSettings(node).DefaultTypeName("_doc");

Answer 1

Two things

1. Index name needs to be lowercase ie "DummyIndex" -> "dummyindex"
2. DummyRecord members need to be properties and not fields

You can check whether the response to any API call is valid , and take action if needed

var client = new ElasticClient();

var createIndexResponse = client.CreateIndex(defaultIndex, c => c
    .Mappings(m => m
        .Map<DummyRecord>(mm => mm
            .AutoMap()
        )
    )
);

if (!createIndexResponse.IsValid) {
    Console.WriteLine(createIndexResponse.DebugInformation);
}

Answer 2

Initiate Your final model and just pass that model to elastic to index it.

Based On Elastic's documentation, you can index your data like this.

    var person = new Person
{
    Id = 1,
    FirstName = "Martijn",
    LastName = "Laarman"
};

var indexResponse = client.IndexDocument(person); 

Updated : Index() vs IndexDocument

IndexDocument() is used when you want to simply index a single document.

Index() If you nedd to set additional parameters , you can use this method.

Take a look at Elastic documentation